chore: Add badges

Author: Stranger6667

README.md

@@ -1,4 +1,9 @@
 # css-inline
+
+[![ci](https://github.com/Stranger6667/css-inline/workflows/ci/badge.svg)](https://github.com/Stranger6667/css-inline/actions)
+[![Crates.io](https://img.shields.io/crates/v/css-inline.svg)](https://crates.io/crates/css-inline)
+[![docs.rs](https://docs.rs/css-inline/badge.svg?version=0.1.0)](https://docs.rs/css-inline/0.1.0/css-inline/)
+
 A crate for inlining CSS into HTML documents. When you send HTML emails you need to use "style" attributes instead of "style" tags.
 
 For example, this HTML: